There is at least a skeleton crew keeping it afloat — when servers are down for ME3 MP only (I.e., no other backwards compatible games experiencing issues), and then are restored within a matter of days, it’s a matter of EA or some contractors going in to resolve issues. Glitches arise but magically disappear after a few weeks. Servers for N7 HQ moved from Asia Pacific region to N.A. as of last year; responsiveness of the site actually improved in that case. A lot being done behind the scenes that can’t be seen and wouldn’t be expected, to your point.